CN115175056A - Shell of sound generating device, sound generating device with shell and electronic equipment - Google Patents
Shell of sound generating device, sound generating device with shell and electronic equipment Download PDFInfo
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- CN115175056A CN115175056A CN202210778742.1A CN202210778742A CN115175056A CN 115175056 A CN115175056 A CN 115175056A CN 202210778742 A CN202210778742 A CN 202210778742A CN 115175056 A CN115175056 A CN 115175056A
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- shell
- sound
- housing
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- sound generating
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- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
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- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a shell of a sound generating device, the sound generating device with the shell and an electronic device with the sound generating device, wherein the shell is provided with a front sound cavity and a rear sound cavity, the part of the shell corresponding to the rear sound cavity is formed into a rear cavity shell, at least one part of the rear cavity shell is formed into a functional shell, the functional shell is at least made of polyurethane aerogel materials, and the density of the functional shell is 0.08g/cm 3 ‑1.5g/cm 3 The functional shell is internally provided with a cellular structure with the aperture of 8nm-300 mu m, wherein the cellular structure comprises mesopores with the aperture of 8nm-50nm, and the pore volume ratio of the mesopores is more than 10%. According to the shell of the sound production device, a large number of through tiny gaps are formed in the functional shell made of the polyurethane aerogel material, and the functional shell has good sound absorption performance and improves the sound production effect of the sound production device by controlling the density of the polyurethane aerogel material, the size of a cellular structure and the ratio of the cellular volumeThe polyurethane aerogel material has good strength, wear resistance and corrosion resistance, and can improve the structural strength of the shell.
Description
Technical Field
The present invention relates to the field of electroacoustic devices, and more particularly, to a housing of a sound generating device, a sound generating device having the housing of the sound generating device, and an electronic device having the sound generating device.
Background
The loudspeaker is more and more widely applied in daily life, and a user requires a micro and light design for the loudspeaker structure, so that the volume of an acoustic rear cavity of the loudspeaker is reduced.
Currently, the most common way to mold the speaker housing is to injection mold the plastic housing required for the product in a mold. The shell of the existing injection molding shell is generally higher in thickness, so that the product is large in mass, the space of a rear cavity is reduced, and the low-frequency performance of the product is poorer; meanwhile, the strength, wear resistance, corrosion resistance and other properties of the injection molding shell are poor, and the use requirements of consumers are difficult to meet.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a casing of a sound generating device, which has the advantages of high strength, good sound absorption effect and strong corrosion resistance.
Another object of the present invention is to provide a sound generating device comprising the casing of the sound generating device.
The invention further aims to provide the electronic equipment consisting of the sound generating device.
In order to achieve the above object, the present invention provides the following technical solutions.
According to the shell of the sound production device of the embodiment of the first aspect of the present invention, the shell has a front sound cavity and a rear sound cavity, the part of the shell corresponding to the rear sound cavity is formed as a rear cavity shell, at least one part of the rear cavity shell is formed as a functional shell, the functional shell is made of at least polyurethane aerogel material, and the density of the functional shell is 0.08g/cm 3 -1.5g/cm 3 The functional shell is internally provided with a cellular structure with the pore diameter of 8nm-300 mu m, wherein the cellular structure comprises mesopores with the pore diameter of 8nm-50nm, and the pore volume ratio of the mesopores is more than 10%.
According to some embodiments of the invention, the polyurethane aerogel material contains urethane groups.
According to some embodiments of the present invention, the molecular chain of the polyurethane aerogel material comprises soft segments and hard segments, the soft segments and the hard segments are arranged alternately, the soft segments have a molecular weight of more than 1500, and the soft segments account for 1% -40% of the molecular chain of the polyurethane aerogel material.
According to some embodiments of the invention, the soft segment comprises a poly-polyol, the poly-polyol being at least one of a polyester polyol, a polyether polyol, a polymer polyol, and a polyurea polyol, and a small molecule chain extender; and/or the hard segment contains at least one of isocyanate, polyalcohol, aromatic diamine, aliphatic secondary amine containing benzene ring and alcohol amine.
According to some embodiments of the invention, the functional shell has a specific surface area of 50m 2 /g-500m 2 /g。
According to some embodiments of the invention, the functional housing has a modulus density ratio of 1GPa cm 3 /g-30GPa·cm 3 /g。
According to some embodiments of the invention, the density of the functional shell is 0.08g/cm 3 -1.5g/cm 3 。
According to some embodiments of the invention, the functional housing has a thickness of 0.2mm to 5mm.
According to some embodiments of the invention, the functional shell further comprises a reinforcing material, and the reinforcing material accounts for 0-60% of the total weight of the functional shell.
According to some embodiments of the invention, the reinforcing material is reinforcing fibers and/or reinforcing particles, wherein the reinforcing fibers are at least one of chopped fibers and continuous fibers, and the reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black or metal particles.
According to some embodiments of the present invention, the rear cavity housing further comprises a main body part bonded to or integrally formed with the functional housing as the rear cavity housing, the main body part being made of at least one of PC and a modified material thereof, PA and a modified material thereof, PPS and a modified material thereof, PP and a modified material thereof, ABS and a modified material thereof, LCP and a modified material thereof, PEI and a modified material thereof, phenol resin and a modified material thereof, epoxy resin and a modified material thereof, unsaturated polyester and a modified material thereof, stainless steel and aluminum alloy, magnesium alloy, and metal matrix composite.
According to some embodiments of the invention, the rear cavity housing is integrally formed with the functional housing.
According to some embodiments of the present invention, a portion of the housing corresponding to the front acoustic cavity is a front cavity housing, the front cavity housing is bonded to the rear cavity housing, and the front cavity housing is made of at least one of PC and a modified material thereof, PA and a modified material thereof, PPS and a modified material thereof, PP and a modified material thereof, ABS and a modified material thereof, LCP and a modified material thereof, PEI and a modified material thereof, phenolic resin and a modified material thereof, epoxy resin and a modified material thereof, unsaturated polyester and a modified material thereof, stainless steel and aluminum alloy, magnesium alloy, and metal matrix composite.
A sound generating apparatus according to an embodiment of a second aspect of the present invention includes: the casing of the sound generating device according to the above embodiment; the sound production monomer, the sound production monomer is located in the shell, the sound production monomer with the shell cooperation in order to incite somebody to action the inside cavity interval of shell becomes preceding sound chamber with back sound chamber.
An electronic device according to a third aspect of the present invention includes the sound emitting apparatus according to the above-described embodiments.
According to the shell of the sound generating device, at least one part of the back cavity shell is set to be the functional shell body prepared from the polyurethane aerogel material, a large number of through tiny gaps are formed in the functional shell body prepared from the polyurethane aerogel material, the functional shell body has good sound absorption performance by controlling the density of the polyurethane aerogel material, the size of a cellular structure and the ratio of pore volume, the sound generating effect of the sound generating device can be improved, and the polyurethane aerogel material has good strength, wear resistance and corrosion resistance, so that the strength and reliability of the shell can be improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of a sound emitting device according to an embodiment of the present invention;
figure 2 is a graph comparing the IMP curves for the shells provided according to example 1 of the present invention with the shells provided by the comparative example.
Reference numerals:
a sound generating device 100;
a housing 10; a front chamber housing 11; a front acoustic chamber 111; a rear chamber housing 12; a rear acoustic chamber 121;
and a sounding unit 20.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the casing 10 of the sound generating device 100 according to the embodiment of the present invention has a front sound cavity 111 and a rear sound cavity 121, a portion of the casing 10 corresponding to the rear sound cavity 121 is formed as a rear cavity casing 12, at least a portion of the rear cavity casing 12 is formed as a functional shell, the functional shell is made of at least a polyurethane aerogel material, and the density of the functional shell is 0.08g/cm 3 -1.5g/cm 3 The functional shell is internally provided with a cellular structure with the aperture of 8nm-300 mu m, wherein the cellular structure comprises mesopores with the aperture of 8nm-50nm, and the pore volume of the mesopores accounts for more than 10%.
In other words, the sound generating device 100 according to the embodiment of the present invention includes the housing 10 and the sound generating unit 20 disposed in the housing 10, the sound generating unit 20 and the housing 10 cooperate to define the front sound cavity 111 and the rear sound cavity 121, wherein the housing structure capable of defining the rear sound cavity 121 is the rear cavity housing 12. A portion of the rear cavity housing 12 may be a functional housing made of a polyurethane aerogel material, or may be a functional housing made of a polyurethane aerogel material as a whole.
The functional shell prepared from the polyurethane aerogel material is internally provided with a large number of through tiny gaps, the tiny gaps form a cellular structure, and the density of the functional shell with the cellular structure can be controlled at 0.08g/cm 3 -1.5g/cm 3 May be, for example, 0.08g/cm 3 、0.1g/cm 3 、0.2g/cm 3 、0.8g/cm 3 、1g/cm 3 、1.5g/cm 3 Etc., the pore diameter of the cell structure is controlled to be between 8nm and 300 μm, and may be, for example, 8nm, 20nm, 50nm, 100nm, 1 μm, 10 μm, 100 μm, 300 μm, etc. The cell structure may include a plurality of mesopores having a size controlled between 8nm and 50nm, for example, 8nm, 10nm, 15nm, 20nm, 40nm, 50nm, etc., and a pore volume ratio of the mesopores is greater than 10%, specifically, 11%, 15%, 20%, etc.
It should be noted that the polyurethane aerogel material is a solid material with large porosity and high specific surface area, and the volume of the polyurethane aerogel material is mostly made of air. The housing 10, which is made of a polyurethane aerogel material, not only has better rigidity, but also has lighter mass, making the acoustic assembly more practical.
The polyurethane aerogel is a polar material, has better compatibility with water in the preparation process, has smaller pore diameter in the interior, has larger strength and pore structure adjusting range, and has more obvious sound absorption improving effect. Casing 10 of sound generating mechanism 100 is in the use, incident sound wave reachs in polyurethane aerogel material surface gets into the cell structure, arouse downthehole air and function casing frame self vibration, make the acoustic energy loss, and polyurethane aerogel's aperture and porosity span are big, can ensure that porosity and aperture are in a suitable value, be favorable to inhaling of the function casing that polyurethane aerogel material preparation formed, even the sound wave passes polyurethane aerogel material, also can form the reflection on the rigid wall of function casing and carry out the secondary and inhale the sound, good sound effect of inhaling has. When the composite material is applied to a loudspeaker, the resonance frequency of the loudspeaker can be reduced, the performance of the loudspeaker at a low frequency band is improved, and the size design of the loudspeaker can be smaller.
In addition, the polyurethane aerogel material still has the advantage of wear resistance and corrosion resistance for the functional housing that is prepared by polyurethane aerogel material also has corresponding advantage, and the functional housing has stronger wear resistance and corrosion resistance promptly, thereby the product reliability is higher.
Therefore, according to the housing 10 of the sound generating device 100 of the embodiment of the present invention, at least a portion of the rear cavity housing 12 is configured as a functional housing made of a polyurethane aerogel material, a large number of through micro gaps are formed inside the functional housing made of the polyurethane aerogel material, and the functional housing has good sound absorption performance by controlling the density of the polyurethane aerogel material, the size of the cell structure, and the ratio of the cell volume, so as to improve the sound generating effect of the sound generating device 100, and the polyurethane aerogel material has good strength, wear resistance, and corrosion resistance, thereby improving the structural strength and reliability of the housing 10.
According to one embodiment of the present invention, the polyurethane aerogel material contains urethane groups. And the carbamate group has good strength and excellent wear resistance and corrosion resistance, so that the functional shell prepared from the polyurethane aerogel material containing the carbamate group has stronger rigidity, good wear resistance and corrosion resistance, and higher product reliability.
In some embodiments of the present invention, the molecular chain of the polyurethane aerogel material comprises soft segments and hard segments, the soft segments and the hard segments are arranged alternately, the molecular weight of the soft segments is greater than 1500, and the soft segments account for 1% -40% of the molecular chain of the polyurethane aerogel material.
That is, the functional housing in the housing 10 of the sound generating device 100 according to the embodiment of the present invention is made of a polyurethane aerogel material, a molecular chain of the polyurethane aerogel material is composed of soft segments and hard segments which are alternately arranged, and the molecular chain of the soft segments is greater than 1500 in the molecular chain of the polyurethane aerogel material, and meanwhile, the molecular weight of the soft segments in the molecular chain is between 1% and 40%, for example, the molecular weight of the soft segments in the molecular chain may be 1%, 2%, 5%, 10%, 15%, 20%, 30%, 40%, etc.
Therefore, by controlling the arrangement of the soft segment and the hard segment of the molecular chain of the polyurethane aerogel material, the proportion of the soft segment in the molecular chain segment and the molecular weight of the soft segment are changed, and the pore volume ratio of the mesopores of the functional shell prepared from the polyurethane aerogel material can be controlled, so that the sound absorption performance and the structural strength of the shell 10 prepared from the polyurethane aerogel material are adjusted.
Optionally, according to some embodiments of the present invention, the soft segment comprises a polymeric polyol, the polymeric polyol being at least one of a polyester polyol, a polyether polyol, a polymer polyol, and a polyurea polyol, and a small molecule chain extender; and/or the hard segment contains at least one of isocyanate, polyalcohol, aromatic diamine, aliphatic secondary amine containing benzene ring and alcohol amine.
In other words, the soft segment in the molecular chain of the polyurethane aerogel material according to the embodiment of the present invention can be composed of polyester polyol including polyester polyol (adipic acid-based polyester diol, aromatic polyester polyol, polycaprolactone polyol, polycarbonate diol), polyether polyol (polyether diol, polyether triol, polyether polyol, polymer polyol and polyurea polyol, small chain extender, etc. wherein the soft segment is preferably polyester triol, polyester polyol having molecular weight of more than 1500 and functional group of more than 2.
Therefore, a soft molecular chain formed by the group is softer, a high molecular chain is wound, formed polymer channels are complex and changeable, a pore structure with a smaller pore diameter is formed, the mesoporous ratio is large, and the sound absorption effect of the polyurethane aerogel material is better.
The polar groups in the hard segment in the molecular chain of the polyurethane aerogel material according to the embodiment of the invention can be carbamate, carbamido and the like, and the groups improve the molecular cohesive energy of the polyurethane aerogel material, so that the polymer has stronger rigidity.
In some embodiments of the invention, the functional shell has a specific surface area of 50m 2 /g-500m 2 /g。
Wherein the specific surface area of the functional shell is the total area of the functional shell per unit mass, including the area of the voids in the polyurethane aerogel material. In the speaker field, the larger the specific surface area of the speaker enclosure 10 is, the denser the surface of the enclosure 10 is, and the incident sound waves reach the material surface of the enclosure 10, and hardly enter the interior of the enclosure 10, so that the effect of reducing the resonance frequency is not obtained due to the loss of the sound energy. If the specific surface area of the speaker housing 10 is too small, the overall strength of the housing 10 is low, which not only makes it difficult to satisfy the rigidity requirement, but also affects the acoustic performance of the speaker. Alternatively, the specific surface area of the functional housing may be 50m 2 /g、60m 2 /g、100m 2 /g、180m 2 /g、200m 2 /g、300m 2 /g、500m 2 In terms of/g, etc.
Therefore, according to the housing 10 of the sound generating device 100 of the embodiment of the present invention, by precisely controlling the specific surface area of the functional housing made of the polyurethane aerogel material, the rigidity requirement of the back cavity housing 12 can be further satisfied, and at the same time, the F0 resonance frequency can be further reduced, and the sound generating effect of the sound generating device 100 can be improved.
According to one embodiment of the invention, the modulus density ratio of the functional shell is 1GPa cm 3 /g-30GPa·cm 3 /g。
Alternatively, in other embodiments of the present invention, the functional shell has a density of 0.08g/cm 3 -1.5g/cm 3 。
That is, the modulus density ratio and the density of the functional shell can satisfy the above requirements at the same time, and one of the parameters can be controlled to satisfy the above requirements. Alternatively, the modulus density ratio of the functional housing may be 1GPa cm 3 /g、2GPa·cm 3 /g、5GPa·cm 3 /g、10GPa·cm 3 /g、20GPa·cm 3 /g、30GPa·cm 3 And/g, etc. The density of the functional shell may be 0.08g/cm 3 、0.1g/cm 3 、0.2g/cm 3 g、0.4g/cm 3 、1.0g/cm 3 、1.5g/cm 3 、1.5g/cm 3 And the like.
Specifically, the modulus density ratio of a product refers to the ratio of the modulus of the product to the mass, and the larger the modulus density ratio, the higher the modulus of the product is at the same density. When other reinforcing materials are added into the functional shell, the modulus of the product is increased and the overall density of the product is also enhanced due to the addition of the reinforcing materials, so that the lightweight design of the product is influenced to a certain extent. According to the invention, by controlling the modulus density of the functional shell, the modulus of the product can be ensured, resonance can be avoided, and the acoustic performance of the product is improved.
Because the density of the functional shell directly affects the weight of the functional shell and the whole shell 10, if the density of the functional shell is too low, the rigidity of the whole shell 10 is low, and the rigidity requirement of the shell 10 is difficult to meet; if the density of the functional housing is too high, the overall weight of the housing 10 is large, which is not favorable for the light and thin design of the product. According to the invention, by limiting the density of the functional shell within a certain range, the weight of the shell 10 can be reasonably controlled on the basis of ensuring the rigidity requirement of the shell 10, and the product design requirement is further met.
According to one embodiment of the invention the thickness of the functional shell is 0.2mm-5mm. For example, it may be 0.2mm, 0.5mm, 1mm, 2mm, 5mm, or the like. By limiting the thickness of the functional shell, the requirements of rigidity and light weight of a product can be further met, and the designability of the sound production device 100 is improved.
In other embodiments of the present invention, the functional shell further contains a reinforcing material, and the reinforcing material accounts for 0 to 60% by weight of the total weight of the functional shell.
That is, the proportion of the reinforcing material in the functional housing may be 0, that is, the functional housing is entirely made of the polyurethane aerogel material, and the proportion of the reinforcing material in the functional housing may be 1%, 5%, 10%, 20%, 40%, 60%, and the like.
Specifically, the reinforcing material is reinforcing fibers and/or reinforcing particles, wherein the reinforcing fibers are at least one of chopped fibers and continuous fibers, the fiber reinforcing material can also be a fabric or a non-woven fabric, and the reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black or metal particles.
The modulus of the product can be increased to a certain extent by increasing the reinforcing materials, the usage amount of the reinforcing materials is too low, the rigidity of the product is not obviously improved, the usage amount of the reinforcing materials is too high, and the acoustic performance of the product is influenced although the rigidity of the product is obviously improved. According to the housing 10 of the embodiment of the invention, by selecting appropriate reinforcing fibers or reinforcing particles, the influence of the reinforcing material on the acoustic performance can be reduced on the basis of ensuring the rigidity of the product.
The housing 10 of the sound generating apparatus 100 according to the embodiment of the present invention may be integrally formed of a polyurethane aerogel material to form the rear chamber housing 12, i.e., the entirety of the rear chamber housing 12 is formed as a functional case. The rear cavity shell 12 of this structure is entirely made of polyurethane aerogel material, and is convenient to prepare, and can more accurately control the rigidity and the lightweight degree of the shell 10, and improve the designability of the sound generating device 100.
The casing 10 of the sound generating device 100 according to the embodiment of the present invention may be a rear cavity casing 12 composed of a main body part and a functional casing part, wherein the functional casing part and the main body part are assembled by bonding or integrally molding. The main body part can be prepared from at least one of PC and modified materials thereof, PA and modified materials thereof, PPS and modified materials thereof, PP and modified materials thereof, ABS and modified materials thereof, LCP and modified materials thereof, PEI and modified materials thereof, phenolic resin and modified materials thereof, epoxy resin and modified materials thereof, unsaturated polyester and modified materials thereof, stainless steel and aluminum alloy, magnesium alloy and metal matrix composite materials.
Therefore, the housing 10 of the sound generating device 100 according to the embodiment of the present invention can be prepared in various ways, and has strong practicability, while satisfying the requirements of product rigidity and light weight, and taking into account the influence on the acoustic performance.
In some embodiments of the invention, the rear housing 12 may be integrally formed with a functional housing. Optionally, the rear housing 12 may also include a bottom plate and side plates disposed around the bottom plate, the side plates cooperating with the bottom plate to define part of the internal cavity of the housing 10, at least one of the bottom plate and the side plates being formed as a functional housing.
That is, the rear cavity housing 12 according to the embodiment of the present invention may be integrally formed as a functional housing, that is, the whole of the rear cavity housing 12 may be made of a polyurethane aerogel material; back chamber shell 12 also can comprise a plurality of parts, including bottom plate and a plurality of curb plate promptly, at least one in a plurality of curb plates and the bottom plate is made by polyurethane aerogel material, and the concrete constitution of back chamber shell 12 can be rationally adjusted according to the in-service use needs, as long as satisfy wherein at least partly functional casing that makes for polyurethane aerogel material can.
Therefore, the material of the rear cavity shell 12 in the shell 10 of the sound generating device 100 according to the embodiment of the invention is flexible to use, convenient to prepare and strong in practicability.
In some embodiments of the present invention, the portion of the housing 10 corresponding to the front acoustic chamber 111 is a front chamber housing 11, and the front chamber housing 11 is bonded to the rear chamber housing 12. The front cavity shell 11 is made of at least one of PC and modified materials thereof, PA and modified materials thereof, PPS and modified materials thereof, PP and modified materials thereof, ABS and modified materials thereof, LCP and modified materials thereof, PEI and modified materials thereof, phenolic resin and modified materials thereof, epoxy resin and modified materials thereof, unsaturated polyester and modified materials thereof, stainless steel and aluminum alloy, magnesium alloy and metal matrix composite materials.
That is, the housing 10 of the sound generating device 100 according to the embodiment of the present invention may be assembled by the front chamber housing 11 and the rear chamber housing 12, and they may be connected by bonding or may be assembled by other methods. The material of the front chamber housing 11 may be the same as or different from the material for preparing the main body of the rear chamber housing 12.
The sound generating device 100 according to the embodiment of the present invention includes the housing 10 of the sound generating device 100 in any of the above embodiments, and the sound generating device 100 further includes a sound generating unit 20 disposed in the housing 10 to perform an electroacoustic conversion to realize a sound generating function of the sound generating device 100. At least a part of the rear cavity housing 12 of the housing 10 is made of the functional shell, so that the acoustic performance of the sound generating device 100 can be improved, the design requirements of lightness, thinness and miniaturization of the sound generating device 100 can be met, and the applicability of the sound generating device 100 in various electronic devices is improved.
The electronic device according to an embodiment of the present invention includes the sound generating apparatus 100 according to the above-mentioned embodiment, wherein the electronic device may be a mobile phone, a notebook computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless bluetooth) headset, a smart speaker, and the like, which is not limited in this respect.
Since the housing 10 of the sound generating device 100 according to the above-mentioned embodiment of the present invention has the above-mentioned technical effects, the sound generating device 100 and the electronic device according to the embodiment of the present invention also have the corresponding technical effects, that is, the housing 10 of the sound generating device 100 has better rigidity and lighter weight, and simultaneously has excellent high temperature resistance effect and high reliability, and also can reduce the F0 resonance frequency, so that the overall listening feeling of the product is better.
The housing of the sound emitting device of the present invention will be described in detail with reference to specific examples and comparative examples.
Before the shell of the sound generating device provided by the embodiment of the invention is prepared, the polyurethane wet gel needs to be prepared firstly, and the concrete steps of preparing the polyurethane wet gel are as follows:
weighing quantitative polycarbonate polyol, quantitative phthalic anhydride polyester polyol and an antioxidant, placing in a three-necked bottle, and dehydrating for 2h at 100 ℃ and-0.1 Mpa; cooling to 80 ℃, adding metered isophorone diisocyanate and a catalyst, uniformly stirring at the speed of 3000r/min, and then reacting for 1h; adding metered 2, 2-dimethylolpropionic acid and 1, 4-butanediol, reducing viscosity after reaction, adding a catalyst for continuous reaction, and measuring the reaction degree by a hydrochloric acid-di-n-butylamine method; and cooling the prepolymer, adding a metered cross-linking agent, emulsifying the defoaming agent and deionized water, adding a chain extender diluted by the deionized water for chain extension, distilling the stably dispersed aqueous polyurethane emulsion under reduced pressure to remove the solvent, filtering, and sealing and storing for later use.
Example 1
In this embodiment, sound generating mechanism is formed by shell and sound production monomer equipment, and wherein, the shell adopts soft section to account for and is 20% polyurethane aerogel material shell to contain the carbon fiber as reinforcing material in the shell, the concrete preparation process of shell is as follows:
1. 50g of polyurethane wet gel and carbon fiber with soft segments accounting for 20 percent of the molecular chain segment are taken, and the polyurethane wet gel containing 4 percent of carbon fiber mass fraction is uniformly prepared.
2. And (4) injection molding the prepared polyurethane wet gel obtained in the first step into a shell.
3. Freezing the shell prepared in the second step at-40 ℃ for 1h, and drying for 2h under the vacuum degree of less than 100 Pa.
And finally obtaining the carbon fiber polyurethane aerogel shell.
Example 2
In this embodiment, the sound generating device is assembled by a housing and a sound generating unit, wherein the housing is a polyurethane aerogel material housing with a soft segment of 30%, and the housing contains carbon fibers as a reinforcing material, and the housing is specifically prepared as follows:
1. 50g of polyurethane wet gel with a soft segment accounting for 30 percent of the molecular chain segment is uniformly mixed with carbon fibers, and the polyurethane wet gel with the carbon fiber mass fraction of 4 percent is uniformly prepared.
2. And D, performing injection molding on the polyurethane wet gel prepared in the step one to form the shell.
3. Freezing the shell prepared in the second step at-40 ℃ for 1h, and drying for 2h under the vacuum degree of less than 100 Pa.
And finally obtaining the polyurethane aerogel shell.
Comparative example
In the comparative example, the sound generating device is assembled by a shell and sound generating monomers, wherein the shell is made of polyester resin, and the concrete preparation process of the shell is as follows: and (3) putting the polyester resin into a mold for injection molding at 180 ℃, and keeping the temperature for 2min to form the shell.
The shells prepared in example 1, example 2 and comparative example 1 were subjected to weight, thickness and mesoporous ratio tests, the shells prepared in example 1, example 2 and comparative example 1 were assembled with a sounding monomer to obtain different sounding devices, each sounding device was subjected to an acoustic test to obtain an actually measured F0 of each sounding device, and the test results are shown in table 1 below.
TABLE 1 Shell test results
| Material | Example 1 | Example 2 | Comparative example |
| Weight of outer shell/mg | 120 | 119 | 500 |
| Thickness of the outer shell/mm | 0.4 | 0.4 | 0.4 |
| Meso |
12 | 14 | 0 |
| F0 | 831 | 811 | 911 |
As can be seen from table 1, under the condition that the shells have the same shape and thickness, the weight of the shells of examples 1 and 2 prepared by using the polyurethane aerogel material is 380mg and 381mg lighter than that of the shells prepared by using PC in the comparative example, and the weight is obviously reduced, which indicates that the shells prepared by using the polyurethane aerogel material according to the embodiments of the present invention can satisfy the light weight requirement of the product.
From the aspect of the mesoporous proportion, the mesoporous proportion of the shells of the embodiments 1 and 2 prepared from the polyurethane aerogel material is obviously greater than that of the shell prepared from the PC in the comparative example, meanwhile, the mesoporous proportion of the shell of the embodiment 1 in which the soft-segment molecular chain proportion of the polyurethane aerogel material is 20% is slightly less than that of the shell of the embodiment 2 in which the soft-segment molecular chain proportion of the polyurethane aerogel material is 30%, which indicates that the soft-segment content of the polyurethane aerogel material in the embodiment 2 is high, the molecular chains are wound, the polymer channels are complex and variable, the pore structure is smaller, and the mesoporous proportion is larger.
From the effect of reducing the F0 of the housing, the actually measured F0 of the housing made of the polyester resin is 911, while the actually measured F0 of the embodiments 1 and 2 made of the polyurethane aerogel material is 831 and 811 respectively, which are both obviously smaller than the F0 of the housing made of the polyester resin, so that the effect of reducing the F0 is achieved, and the effect of reducing the F0 of the housing of the embodiment 2 with the soft molecular chain occupying a higher ratio in the polyurethane aerogel material is greater than the effect of reducing the F0 of the housing of the embodiment 1 with the soft molecular chain occupying a lower ratio in the polyurethane aerogel material, which indicates that the effect of reducing the F0 of the housing can be achieved by adjusting the soft molecular chain occupying ratio of the polyurethane aerogel material in the housing to a certain extent, thereby reducing the resonant frequency of the product and improving the sound production effect of the sound production device.
As can be seen from table 1, the housings of examples 1 and 2, which are prepared by using the polyurethane aerogel material according to the embodiments of the present invention, have lighter weight, can provide a larger virtual space, and effectively reduce the F0 resonance frequency.
The housings obtained in example 1 and comparative example were assembled with a sounding unit to obtain different sounding devices, and each sounding device was subjected to an acoustic test to obtain an IMP (impedance test) graph as shown in fig. 2.
In the IMP graph, the abscissa represents the frequency (Hz) of the sound vibration, and the ordinate represents the impedance value of the sound, and the frequency when the impedance value has the first peak, i.e., the resonance frequency F0 of the sound generating apparatus.
As can be seen from fig. 2, the resonant frequency F0 of the sound generating device provided in example 1 and having the polyurethane aerogel shell is 800Hz, the resonant frequency of the sound generating device provided in the comparative example and having the polyester resin (PC) shell is 900Hz, and example 1 is reduced by 100Hz compared with the comparative example, so that F0 is effectively reduced, and the bass sound effect of the sound generating device is better.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (15)
1. The utility model provides a shell of sound generating mechanism, its characterized in that, the shell has preceding sound chamber and back sound chamber, the shell with the part that back sound chamber corresponds forms back chamber shell, at least some formation of back chamber shell is the function casing, the function casing is made by polyurethane aerogel material at least, the density of function casing is 0.08g/cm 3 -1.5g/cm 3 The interior of the functional shell is provided with a cellular structure with the pore diameter of 8nm-300 mu m,
wherein the cellular structure comprises mesopores with a pore diameter of between 8nm and 50nm, and the pore volume of the mesopores accounts for more than 10%.
2. The housing of a sound generating device according to claim 1, wherein said polyurethane aerogel material contains urethane groups.
3. The housing of a sound generating device according to claim 2, wherein the molecular chain of the polyurethane aerogel material comprises soft segments and hard segments, the soft segments and the hard segments are alternately arranged, the molecular weight of the soft segments is greater than 1500, and the soft segments account for 1% -40% of the molecular chain of the polyurethane aerogel material.
4. The housing of a sound generating device as defined in claim 3, wherein said soft segment contains a polymeric polyol, said polymeric polyol being at least one of a polyester polyol, a polyether polyol, a polymer polyol and a polyurea polyol, and a small molecule chain extender;
and/or the hard segment contains at least one of isocyanate, polyalcohol, aromatic diamine, aliphatic secondary amine containing benzene ring and alcohol amine.
5. The casing of sound-generating apparatus according to claim 1, wherein the functional housing has a specific surface area of 50m 2 /g-500m 2 /g。
6. The casing of the sound-emitting device as claimed in claim 1, wherein the functional casing has a modulus density ratio of 1GPa cm 3 /g-30GPa·cm 3 /g。
7. The sound generating apparatus as claimed in claim 1, wherein the density of the functional housing is 0.08g/cm 3 -1.5g/cm 3 。
8. The housing of a sound generating device as claimed in claim 1, wherein the functional housing has a thickness of 0.2mm to 5mm.
9. The casing of the sound generating apparatus according to claim 1, further comprising a reinforcing material in the functional casing, wherein the reinforcing material is 0-60% by mass of the total weight of the functional casing.
10. The casing of the sound generating apparatus according to claim 9, wherein the reinforcing material is reinforcing fibers and/or reinforcing particles, wherein the reinforcing fibers are at least one of chopped fibers and continuous fibers, and the reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black or metal particles.
11. The housing of the sound generating apparatus according to any one of claims 1 to 10, wherein said rear cavity housing further comprises a main body portion bonded to or integrally formed with said functional housing, said main body portion being made of at least one of PC and modified materials thereof, PA and modified materials thereof, PPS and modified materials thereof, PP and modified materials thereof, ABS and modified materials thereof, LCP and modified materials thereof, PEI and modified materials thereof, phenolic resin and modified materials thereof, epoxy resin and modified materials thereof, unsaturated polyester and modified materials thereof, stainless steel and aluminum alloy, magnesium alloy, and metal matrix composite.
12. The sound generating apparatus housing as claimed in any one of claims 1-10, wherein the back volume housing is integrally formed with the functional housing.
13. The cover for a sound-generating apparatus according to any one of claims 1 to 10, wherein the portion of the cover corresponding to the front sound cavity is a front cavity cover, the front cavity cover is bonded to the rear cavity cover, and the front cavity cover is made of at least one of PC and its modified material, PA and its modified material, PPS and its modified material, PP and its modified material, ABS and its modified material, LCP and its modified material, PEI and its modified material, phenol resin and its modified material, epoxy resin and its modified material, unsaturated polyester and its modified material, stainless steel and aluminum alloy, magnesium alloy, and metal matrix composite.
14. A sound generating device, comprising:
a housing for a sound emitting device according to any one of claims 1-13;
the sound production monomer, the sound production monomer is located in the shell, the sound production monomer with the shell cooperation with will the inside cavity interval of shell becomes preceding sound chamber with back sound chamber.
15. An electronic device, characterized in that it comprises a sound-emitting device according to claim 14.
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| CN115746497A (en) * | 2022-10-14 | 2023-03-07 | 歌尔股份有限公司 | Shell of sound generating device, sound generating device with shell and electronic equipment |
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| CN115175056B (en) | 2024-05-14 |
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